Vibratory cutter



Patented Pelo. 2U?, M3323..

nire

ALEXANDER C. REID, 0F GENOA, ILLINOIS.

VIBRATORY CUTTER.

Application filed January 19, 1922. Serial No. 530,321.

To all 'whom t may concern.' l

Be it known that I, ALEXANDEI; C. REID, acitizen of the United States,residing at Genoa, in the county of De Kalb and State of Illinois, haveinvented a certain new and useful Improvement in Vibratory Cutters, ofwhich the following is a full, clear, concise, and exact description,reference being had to the accompanying drawings, forming a part of thisspecification.

y invention relates to vibratory cutters and more particularly to. avibratory cutter which is provided with a blade that vibrates forcutting purposes, the movement of the blade in one direction beingobtained by means of an electromagnet and the movement in the oppositedirection being obtained by means of a spring.

It is a purpose of the invention to provide a device of the abovementioned character which is operated by alternating current. In such adevice it is important tohave the spring of just the proper flexibility,for if the spring is too stiff the moving system comprising the bladeand spring will be so timed as to vibrate at a higher frequency thandesired, while if the spring is too flexible 'or weak, the movingVsystem will be tuned to a lower frequency than desired. Ordinarily adevice would be operated on a @0 cycle current, and it is desired totune the moving system to the same frequency by properly tuning themoving parts so as to obtain the desired frequency. The maximum of powercan be obtained from the electromagnetic operating means by so adjustingthe frequency..

It is particularly a purpose of the invention to provide a spring in adevice of the above mentioned character which is made of a greaterstiffness than is necessary, and is weakened by grinding away a portionthereof, or in any other way removing a portion thereof so as to obtainthe desired flexibility, thus making it possible to obtain a very closeadjustment of the flexibility of the spring.

Other objects and advantagesof the in vention will appear as thedescription of' the accompanying drawings proceeds. However, I desire tohave it distinctly understood that I do not intend to limit myself tothe exact details shown or described, but that I intend to include aspart of my invention all such obvious changes and modifications of partsas wouldpccur to a person skilled in this art. In the drawings is showna vibratory hair clipper having a'toothed v movable blade and a toothedstationarv blade, but it is to be understood that the iiivention is notto be limited to the exact form o f blade used. The principle of theinvention may be applied to any moving or sliding cutting blade which isactuated in one direction "by a direction by the spring forming a partof the present invention. v

In the drawingsm:

F ig. 1 is a fragmentary plan View of a clipper with the cover thereofremoved showing my improved spring device in position therein;

Fig. 2 is a section thereof taken on the line 2-2 of Fig. 1;

1g. 3 a perspective view of a flat spring which may be used; and 1g. 4is a similar view of a spring that is substantially square in lcrosssection.

.Referring in detail to the drawings, in Fig. 1 is shown a lcasing 5within which is mounted an electromagnet comprising the solenoids 6 andhaving the pole pieces 7 with which the armature 8, which is pivotallymounted relative to is adapted to cooperate. Secured rigidly to thearmature 8 is the driving arm 10 which has pivotally mounted on the endthereof the movable block 18 carrying the blade 11 which cooperates-withthe blade 12, which 1s iixedly mounted on the casing. 5. The blades 11and 12 are provided with cooperating teeth 13' and 14 if desired. Abracing member 15 is pivotally connected with the armature 8 at one end'thereof by means of the pivot member 16 and to the block 18 at the otherend thereof by means of the pivot 17.. The blade 11 is mounted on ablock 18, which block has one end of the springl9 se! cured thereto, theother end of the spring 19 being 'secured to the casing 5 at 20. Thespring 19 is secured to the block 18 by means of the link 25 having thepivot pin 23 eX- tending through a suitable openingy in the block and tothe spring 21 by means of the lugs 24 passing through openings in thespring. The spring 19 must be of such flexibility as to provide for theproper period of vibration ofthe bladel 11, so that the frequency of thevibration will not be interfered with by the spring member 19. In orderto obtain the desired frequency for the member 19, the same ispreferably ground away as at 21 to provide a weakened portion magnet andin the opposite the casing at 9,

noids 6. The spring 19 is shown in Figs.v

l to 3 inclusive -as being a Hat spring, while in Figg 4 is shown adifferent form of spring, said spring being designated 19 and beingprovided with a cutaway portion 21.

The spring shownin Fig. 4 is made of substantially the same thickness asthe width thereof. It will, of course, be understood that a spring ofany desired lcross-section can be used, the important feature being toprovide a spring having a cutaway portion -for tuning ythe same in adevice having a,

vibratory cutting blade which moves or slides relative to the stationaryparts of the device. It will also be evident that it is not necessarythat the spring be perfectly straight as shown in Figs. 3 and 4, but thesame may be of any desired .form lengthwise thereof so' long, -as thesame is not a spiral spring. The blade 11 is pressed toward the blade 12by the spring member 22, as will be evident from Figs. 1 and 2.v

Having thus described my invention', what I desire to claim and secureby U. Letters Patent is:

1. A devicev ofthe character described comprising a supporting member, acutting l blade movably mounted thereon, electromag netic means formoving said blade in one 'f direction, and spring means for moving saidblade in the opposite direction, said sprmg means having a weakenedportion.

2. A device of the character described comprising a supporting member, acutting blade movably mounted thereon, and means for vibrating saidcutting blade comprising a driving link and electromagnetic means formoving said link and blade in one direction energized from a sourceof'alternating current and spring means extending parallel to saidlink'for moving said blade in the opposite direction, said spring meanshavinga weakened portion to tune the moving parts of said device tothefrequency of said source of current.

- 3. -A device of the character described comprising a supportingmember, a-cutting being f blade movably mounted thereon, and means formoving said blade comprising an electromagnet, an. armaturepivotallymounted on said support on a rigid pivot cooperating with said magnet,means connecting said blade with said armature and a spring, saidelectromagnet moving said blade in one direction and said spring moving'the same in the opposite direction, said spring having a weakenedportion and said connecting means and said spring cooperating to guidesaid blade in its movement.

4. A device of the' character described comprising a supporting member,a cutting blade movably mounted thereon, and means for moving said bladecomprising an electromagnet, a source of alternating current connectedtherewith, an armature pivotally mounted on said support ona rigid pivotcooperating with said magnet, means con# vnecting said blade with saidarmature and a spring connected with said blade, said electromagnetmoving said blade in one direction and said spring moving the same inthe opposite direction, said spring having a portion of reduced crosssection, whereby the iexibility of said spring may be in creased to tunethe vibrations of the moving parts of said device to the frequency ofsaid source of current.

5. A device of the character described comprising a supporting member, acutting blade movably mounted thereon, and driving means for said bladecomprising electromagnetic means for moving said blade in one direction,and spring means for mov,- ing said blade in the opposite direction,said spring means having 4a weakened portion between the ends thereof. l

6. A device of the character described comprising a supporting member, acutting blade movably mounted thereon, and means for moving said bladecomprising an elec-4 tromagnet, an armature pivotally mounted on saidsupport on a rigid pivot cooperating with said magnet, means connectingsaid .blade with said armature and a spring, said electromagnet movingsaid blade. in one direction. and said spring moving thev same in theopposite direction, said spring having a weakened portion between theends thereof.

In witness whereof, I hereunto subscribe my name this 4th day of 1922.

ALEXANDER C. REID.v

January A. D.,

